Models 14 NV
1. All models with 14 NV engine have ignition timing adjusted for use with 95 RON unleaded petrol and no other adjustment is required.
2. If required, leaded petrol (98 RON) can be used without adverse effects.
Models 1.6, 1.8 and 2.0 liters with one overhead camshaft
Note: Models with catalytic converter must always be run on 95 RON unleaded petrol and although a fuel octane coding plug may be fitted, it must not be tampered with.
3. Models other than 14 NV are equipped with such a plug, which is located in a bracket in the left rear part of the engine compartment (see illustration).
4. The plug can be turned over in the connector. On one side there is a mark "A" or "98" which corresponds to the position for using leaded petrol 98 RON. On the other side there is a mark "B" or "95" which corresponds to the position for using unleaded petrol 95 RON. All cars are set from the manufacturer to use unleaded petrol 95 RON.
5. Before changing the filler cap to use a different type of gasoline, first empty the fuel tank.
6. Fill the fuel tank with the required type of gasoline.
7. Make sure the ignition is off, then remove the bracket and disconnect the coding plug.
8. Rotate the plug 180° so that the corresponding octane mark is at the top (see point 4), then insert the plug and secure it with the bracket.
9. Please note that using higher octane gasoline will not cause damage but gasoline with lower octane rating should not be used
Models 20XE, C20XE and X20XEV
10. These models have a coding plug for ignition timing, not fuel octane, (although the method of action is similar) and its position cannot be changed. It is designed to provide the Motronic unit with the correct information stored in memory.
11. On these models, the knock sensor circuit allows the Motronic unit to compensate for differences in the octane number of the gasoline used, without the need for manual adjustment. But remember that all cars with a catalytic converter must be operated on unleaded gasoline only.
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